“昆虫咬伤”常见的英文表达是 “insect bite” 。
例句：
He got an insect bite on his arm and it became swollen.（他的手臂被昆虫咬了一口，肿了起来。）
If you have an insect bite, clean the area first.（如果你被昆虫咬伤，先清洁受伤部位 。）